534 reputation
714
bio website list.seqfan.eu
location FR
age 65
visits member for 4 years, 8 months
seen Dec 12 at 12:28
Administrator of the seqfan (Integer Sequences) mailing list and old contributor of Neil Sloane's O.E.I.S. (Wiki version here.)

Oct
9
awarded  Constituent
Oct
4
awarded  Caucus
Jun
25
awarded  Excavator
Jun
25
awarded  Suffrage
Jun
25
awarded  Citizen Patrol
Feb
8
comment Mathematical ideas named after places
And there is the Syracusan Square which is a special case of Graeco-Latin square ...
Oct
11
awarded  Nice Answer
Apr
15
awarded  Yearling
Dec
19
awarded  Necromancer
Apr
16
awarded  Yearling
Aug
28
accepted What is exactly the (singularity) confinement property ?
Jun
22
awarded  Necromancer
May
29
comment What are the most misleading alternate definitions in taught mathematics?
@Omar: This definition by subset of the product of domain and codomain is not only a trick. This is a good basis for combinatorial thinking and fits nicely with the various ways of counting fundamental objects.
May
29
comment What are the most misleading alternate definitions in taught mathematics?
@Christos: As previously commented there is the 3. about partitions of a set. There are cases where you better use def 1 to prove there is one. In fact we bother discussing many kinds of relations. Before introducing equivalence relations, you can take some time to define strict and inclusive order relations, which are antisymmetric. It prepares you to the fact that all these concepts are related. And is a good preparation for lattice theory.
May
23
awarded  Enthusiast
May
21
comment Books you would like to see translated into English.
I am afraid these are (mathematically) of anecdotical interest and that Grothendieck has again recently vetoed translations and publications in any form of his magnus opus.
May
19
comment Does every finitely presentable group have a presentation that simultaneously minimizes the number of generators and number of relators?
Except for some classes of presentable groups which are decidable.
May
18
comment What should be offered in undergraduate mathematics that's currently not (or isn't usually)?
Of course I agree. But it should also don't hide that their are also functional and difference equations.
May
17
comment A place to find original papers
By looking I found that most articles of Sophus Lie were reprinted in a collected works series, edited among others by Engels and published by Teubner in the 1930s.
May
17
revised A place to find original papers
Added specific references to Lie articles